///
// * jdbm LICENSE v1.00
// *
// * Redistribution and use of this software and associated documentation
// * ("Software"), with or without modification, are permitted provided
// * that the following conditions are met:
// *
// * 1. Redistributions of source code must retain copyright
// *    statements and notices.  Redistributions must also contain a
// *    copy of this document.
// *
// * 2. Redistributions in binary form must reproduce the
// *    above copyright notice, this list of conditions and the
// *    following disclaimer in the documentation and/or other
// *    materials provided with the distribution.
// *
// * 3. The name "jdbm" must not be used to endorse or promote
// *    products derived from this Software without prior written
// *    permission of Cees de Groot.  For written permission,
// *    please contact cg@cdegroot.com.
// *
// * 4. Products derived from this Software may not be called "jdbm"
// *    nor may "jdbm" appear in their names without prior written
// *    permission of Cees de Groot. 
// *
// * 5. Due credit should be given to the jdbm Project
// *    (http://jdbm.sourceforge.net/).
// *
// * THIS SOFTWARE IS PROVIDED BY THE ndbm PROJECT AND CONTRIBUTORS
// * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
// * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
// * CEES DE GROOT OR ANY CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// * OF THE POSSIBILITY OF SUCH DAMAGE.
// *
// * Copyright 2000 (C) Cees de Groot. All Rights Reserved.
// * Contributions are Copyright (C) 2000 by their associated contributors.
// *
// * $Id: Location.java,v 1.2 2003/11/01 14:17:21 dranatunga Exp $
// 

//*************************************************************************
//**  Included in JDMB 1.0 port to SharpDBM;  11/2013 Cyrus Neah cneah@codingreal.com
//**  SharpDBM is an independent reimplementation of the JDBM 1.0 software library in C#  
//*************************************************************************

namespace SharpDBM.recman
{

///
// * This class represents a location within a file. Both physical and
// * logical rowids are based on locations internally - this version is
// * used when there is no file block to back the location's data.
// 
	internal   class Location
	{
		private long block;
		private short offset;

//    *
//     * Creates a location from a (block, offset) tuple.
//     
		internal Location(long block, short offset)
		{
			this.block = block;
			this.offset = offset;
		}

//    *
//     * Creates a location from a combined block/offset long, as
//     * used in the external representation of logical rowids.
//     * 
//     * @see #toLong()
//     
		internal Location(long blockOffset)
		{
			this.offset = (short)(blockOffset & 0xffff);
			this.block = blockOffset >> 16;
		}

//    *
//     * Creates a location based on the data of the physical rowid.
//     
		internal Location(PhysicalRowId src)
		{
			block = src.getBlock();
			offset = src.getOffset();
		}

//    *
//     * Returns the file block of the location
//     
		internal virtual long getBlock()
		{
			return block;
		}

//    *
//     * Returns the offset within the block of the location
//     
		internal virtual short getOffset()
		{
			return offset;
		}

//    *
//     * Returns the external representation of a location when used
//     * as a logical rowid, which combines the block and the offset
//     * in a single long.
//     
		internal virtual long toLong()
		{
			return (block << 16) + (long) offset;
		}

	// overrides of java.lang.Object

		public override bool Equals(object o)
		{
			if (o == null || !(o is Location))
				return false;
			Location ol = (Location) o;
			return ol.block == block && ol.offset == offset;
		}

		public override string ToString()
		{
			return "PL(" + block + ":" + offset + ")";
		}
        public override int GetHashCode()
        {


            return this.GetHashCode();
        }
	}

}